

#flex_div{
    display: flex;
    flex-wrap: wrap;
}

#six_angle {
    width: 0;
    height: 0;
    border-top: 100px solid red;
    border-right: 50px solid transparent;
    border-left: 50px solid transparent;
    position: relative;
    margin: 50px;
}
#six_angle::after{
    content: '';
    content: '';
    border-bottom: 100px solid red;
    border-right: 50px solid transparent;
    border-left: 50px solid transparent;
    position: absolute;
    top: -125px;
    right: -50px;
}

#border_area{
    width: 25px;
    height: 25px;
    border-bottom: 50px solid red;
    border-top: 50px solid darkblue;
    border-right: 50px solid goldenrod;
    border-left: 50px solid hotpink;
    margin: 25px;
    background: black;
    box-sizing: content-box;
}


#border_area_2{
    width: 0;
    height: 0;
    border-top:50px solid red;
    border-right: 50px solid blue;
    margin: 25px;
}
#border_area_3{
    width: 0;
    height: 0;
    border-bottom:50px solid red;
    border-right: 50px solid blue;
    margin: 25px;
}
#arrow{
    width: 0;
    height: 0;
    border-top: 50px solid transparent;
    border-right: 50px solid blue;
    margin: 25px;
    position: relative;
}

#arrow::after{
    content: " ";
    border: 0 solid transparent;
    border-top: 10px solid red;
    width: 40px;
    height: 40px;
    position: absolute;
    border-radius: 40px 0 0 0;
    transform: rotate(45deg);
    top: -51px;
    right: -22px;
}